GSD-14 TOOTH ROOT CAPACITY OF INTERNAL GEARINGS IN PLANETARY GEARS(GEAR STRENGTH AND DURABILITY)

抄録

As compared with external gearings, the proof of the fatigue strength in internal toothings of planetary gearings is becoming more and more complex. This is due to the additional stress proportions in the gear rim. A method based on analytical solutions for a simplified internal gear model and on approximate solutions from numerical calculations of variants allows the determination of local tooth root stresses and their rating. The draft of the VDI-Richtlinie 2737 (guideline 2737 by the Verein Deutscher Ingenieure) "Calculation of the Load Capacity of the Tooth Root in Internal Toothings with Influence of the Gear Rim" uses the systematics and the relationships of DIN 3990, extending or specifying them. The fixing of the internal gear has a considerable effect on the gear rim stiffness. For an approximate calculation of the load capacity there can be estimated the influence of the mounting of the internal gear without numerical simulations.